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Proceedings Paper

A high-resolution Fourier transform spectrometer for astronomical observations and development of wavelength standards
Author(s): Ulrike Lemke; Ansgar Reiners; Sebastian Schäfer
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Paper Abstract

At the Institute for Astrophysics Goettingen (IAG), we are purchasing a high resolution Fourier Transform Spectrograph (FTS) for astronomical observations and development of calibration standards aiming at high wavelength precision. Astronomical spectrographs that work in the regime of very high resolution (resolving powers λ/δλ≥105) now achieve unprecedented precision and stability. Precise line shifts can be investigated to conclude for an objects radial velocity relative to the observer. As a long-term scientific goal, the evolution of galaxy redshift due to dark energy can be monitored. Also, the detection of lower mass, down to Earth-like planets will become feasible. Here, M-dwarfs are promising objects where an orbiting exo-Earth can cause a wavelength shift large enough to be detected. Emitting mainly in the near infrared (NIR), these objects require novel calibration standards. Current schemes under consideration are gas cathode lamps (e.g. CN, UNe) and a highly stable Fabry-Perot interferometer (FPI) to act as a cost-efficient alternative to the laser frequency comb (LFC, [1]). In addition to experiments exploring novel wavelength calibration types, light will be fed from our telescopes at IAG. A Vacuum Tower Telescope (VTT) for solar observations and the 50 cm Cassegrain telescope allow to investigate stellar and spatially resolved light at our facilities.

Paper Details

Date Published: 13 September 2012
PDF: 7 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845047 (13 September 2012); doi: 10.1117/12.981589
Show Author Affiliations
Ulrike Lemke, Institute for Astrophysics Göttingen (Germany)
Ansgar Reiners, Institute for Astrophysics Göttingen (Germany)
Sebastian Schäfer, Institute for Astrophysics Göttingen (Germany)

Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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